(also same song sheet or hymnal) to be in complete accord concerning a decision that needs to be undertaken, or to have identical perspectives on a given issue; comes from the requirement for church choirs to have consistent musical instructions in order to sing harmoniously, although in an increasingly post-Christian Western culture this derivation may not be commonly understood; this condition contrasts with the cacophony that would presumably result were singers to attempt to perform different hymns simultaneously; other jargon of ecclesiastical origin includes preach to the choir and build the church for Easter